For the First Excited State (N = 2) of the Particle

For the first excited state (n = 2) of the particle in a box of width L,what is the uncertainty in momentum?

A) $\pi$$\ddot{A}$$\S$ / 2
B) 3 $\pi$$\ddot{A}$$\S$ / 2
C) $\ddot{A}$$\S$
D) $\pi$$\ddot{A}$$\S$